Help me to learn how to make my friend feel better about herself?

I have this one friend called Tina, who’s jealous of me, as she perceives me to be prettier, smarter, more successful and preferred by her dog, to her. I’m not the kind to show off, be unkind or competitive, but I am quite attractive, reasonably intelligent and popular and her dog prefers me to her. I have good self esteem, but I’m not conceited and I’d like to know how to help her feel more confident and realise that she’s every bit as good as I am. How do I achieve this? I am autistic and my awareness of social cues is poor.

Help me to learn how to make my friend feel better about herself?
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